Cutting tool



CUTTING TooL Filed Sept. 22, 1939 The machined frusto-conical portion 34of the shaft'z rests on the balls 5U and serves as an adjusting surfacetherefor.

The screw threaded shaft 28, on its end ad- 6 jacent the lower surfaceof the upper arm 23 of the bifurcated end of the shaft 22, carries inscrew threaded engagement a retainer 54 which has an arcuate portion 55to accommodate the balls 50. The periphery of the retainer 55 iscylindrical,

l as shown at 5'6, and carries at its lower end a. right angular portion51 which forms an L shaped abutment to seat in a correspondingly shapedrecess 60 in the upper face of the cutting disk 4|.

l Referring more particularly to Figure 4,theup per clamp l carries apointer 63 which is adaptedv4 for registration with an index @d which isscribed on the adjacent portion of the end of the shaft i 2.

y From the foregoing, it will be noted that the cutting disk di isentirely supported by anti-friction ball bearings. This provides freeturning of the cutting disk si, which is essential to avoid evenmomentary stoppage or reduction. of speed of rotation of the latterwhich, at high cutting speeds would cause burning of the cutting edge t3of the cutting tool, thereby necessitating rex placement.

In addition, the holder provided bythe elements 6 and i and cooperatinginstrumentalities, a0 provides rapidand easy changing of the cuttingangle of the cutting disk,

The device of the invention may be employed for turning, boring,planing, etc., and due to the construction and arrangement of the parts.pro- @5 vides a cutting disk having not only an increased life ofservice, but also one which permits greatly increased cutting speeds.

\While we have shown and described one specinc embodiment of the presentinvention, it will be seen that we do not wish to be limited exactlythereto.since various modifications may be made without departing fromthe scope ofthe inven- 6 tion, as dened by the following claims.

We claim:

1. A rotatable cutting tool comprising a bifurcated shaft, a spindleextending between the bifurcations of said shaft, an anti-frictionbearl0 ing-.carried by said spindle, and a rotatable cutting diskmountedon said anti-friction bearing.

` furcated shaft, a spindle extending between the bifurcations of saidshaftran anti-friction bearing carried by said spindle, a cutting diskmounted on said anti-friction bearing, an anti-friction bearing disposedbetween said rotatable cutting 25 disk and said spindle, and means foradjusting said last-named anti-friction bearing.

4. A rotatable cutting tool comprising a bin furcated shaft, a spindleextending between the bifurcations of said shaft, axially aligned setsof anti-friction bearings carried by said spindle between the saidbifurcations, andV a rotatable cutting disk mounted between the saidsets of antifx'iction bearings.

BRYANT BANNISTER. GEORGE c. GREENWOOD.

